<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Proxy for quoted-printable content encoders.
 *
 * Switches on the best QP encoder implementation for current charset.
 *
 * @package    Swift
 * @subpackage Mime
 * @author     Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
 */
class Swift_Mime_ContentEncoder_QpContentEncoderProxy implements Swift_Mime_ContentEncoder
{
	/**
	 * @var Swift_Mime_ContentEncoder_QpContentEncoder
	 */
	private $safeEncoder;

	/**
	 * @var Swift_Mime_ContentEncoder_NativeQpContentEncoder
	 */
	private $nativeEncoder;

	/**
	 * @var null|string
	 */
	private $charset;

	/**
	 * Constructor.
	 *
	 * @param Swift_Mime_ContentEncoder_QpContentEncoder $safeEncoder
	 * @param Swift_Mime_ContentEncoder_NativeQpContentEncoder $nativeEncoder
	 * @param string|null $charset
	 */
	public function __construct(Swift_Mime_ContentEncoder_QpContentEncoder $safeEncoder, Swift_Mime_ContentEncoder_NativeQpContentEncoder $nativeEncoder, $charset)
	{
		$this->safeEncoder = $safeEncoder;
		$this->nativeEncoder = $nativeEncoder;
		$this->charset = $charset;
	}

	/**
	 * {@inheritdoc}
	 */
	public function charsetChanged($charset)
	{
		$this->charset = $charset;
	}

	/**
	 * {@inheritdoc}
	 */
	public function encodeByteStream(Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0, $maxLineLength = 0)
	{
		$this->getEncoder()->encodeByteStream($os, $is, $firstLineOffset, $maxLineLength);
	}

	/**
	 * {@inheritdoc}
	 */
	public function getName()
	{
		return 'quoted-printable';
	}

	/**
	 * {@inheritdoc}
	 */
	public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
	{
		return $this->getEncoder()->encodeString($string, $firstLineOffset, $maxLineLength);
	}

	/**
	 * @return Swift_Mime_ContentEncoder
	 */
	private function getEncoder()
	{
		return 'utf-8' === $this->charset ? $this->nativeEncoder : $this->safeEncoder;
	}
}
